The Los Angeles Kings of the NHL acquired the rights to White in the 1967 NHL expansion, and White was the Kings' best defenceman out of the gate, leading the team in scoring both full years he played for them. During the 1970 season, White was traded to the powerful Chicago Black Hawks, for whom he would play the remainder of his career. Paired with rushing defenceman Pat Stapleton, they formed one of the greatest defensive pairings of the decade, and despite recurring minor injuries, White averaged nearly 30 assists a season in his five full seasons with Chicago. During that time, he was named to the NHL's Second All-Star squad on defence in 1972, 1973 and 1974, as well as being named to play in the All-Star Game for six consecutive seasons between 1969 and 1974. He was also a member of the Canadian team in the 1972 Summit Series against the Soviets, playing eight games.

Already missing significant time in the previous seasons due to injuries, White suffered a neck injury in the 1976 playoffs from which he sustained lingering nerve damage, and retired in consequence.

White finished his NHL career with 50 goals, 215 assists and 265 points in 604 games, with 495 penalty minutes. At the time of his retirement, even though he had played only six full seasons with the Hawks, he was in the top five of all-time Black Hawk defence scorers.

White replaced long-time Black Hawks coach Billy Reay as interim coach midway through the 1977 season, but failed to improve the team's fortunes and left after that season. He later went on to coach his old junior team, the Toronto Marlboros.